Thumper Bio Monitor

Making a Biosphere monitor for Turtle Thumper.  Wanting to view Air & Water Temp as well as humidity.  Also plan on adding a pH probe and Salinity probe.

Arduino Code:

//   MattEccles.me
//   DHT11 Humidity and Temperature Sensor
//   DS18B20 Waterproof Temperature Probe
//   Displayed on I2C LCD Display
//   Credits: Matthew Eccles
 
/*—–( Import Libraries )—–*/
#include
#include
#include
#include
#include

/*—–( Declare Constants, Pin Numbers )—–*/
#define ONE_WIRE_BUS 3
#define DHT11PIN 2
#define analogPin  A0 //the thermistor attach to
#define beta 4090 //the beta of the thermistor

/*—–( Declare objects )—–*/
// set the LCD address to 0x27 for a 20 chars 4 line display
// Set the pins on the I2C chip used for LCD connections:
//                    addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address
dht11 DHT11;
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
const int ledPin4 = 4;       // pin that the LED is attached to
DeviceAddress insideThermometer = { 0x28, 0x94, 0xE2, 0xDF, 0x02, 0x00, 0x00, 0xFE };
DeviceAddress outsideThermometer = { 0x28, 0x6B, 0xDF, 0xDF, 0x02, 0x00, 0x00, 0xC0 };
DeviceAddress dogHouseThermometer = { 0x28, 0x59, 0xBE, 0xDF, 0x02, 0x00, 0x00, 0x9F };

/*—-( SETUP: RUNS ONCE )—-*/
void setup()
{
  Serial.begin(9600); //(Remove all ‘Serial’ commands if not needed)
  sensors.begin();
  sensors.setResolution(insideThermometer, 10);
  sensors.setResolution(outsideThermometer, 10);
  sensors.setResolution(dogHouseThermometer, 10);
  Serial.println(“Dallas Temperature IC Control Library Demo”);
  lcd.begin(20,4);         // initialize the lcd for 20 chars 4 lines, turn on backlight
  lcd.backlight();  
  pinMode(ledPin4, OUTPUT);
}
/*–(end setup )—*/

//void printTemperature(DeviceAddress deviceAddress)
//{
//  float tempC = (sensors.getTempC(deviceAddress) * 9.0 / 5.0) + 32.0;
//  float temperatureF = ((float)tempC * 9.0 / 5.0) + 32.0;
//  Serial.print(temperatureF), 0; Serial.println(” degrees F”);
//  if (tempC == -127.00) {
//    Serial.print(“Error getting temperature”);
//  } else {
//    Serial.print(“C: “);
//    Serial.print(tempC);
//  }
//}

/*—-( LOOP: RUNS CONSTANTLY )—-*/
void loop()
{
  int reading = analogRead(3);
  float voltage = reading * 5.0;
  Serial.print(voltage); Serial.println(” volts”);
  float temperatureC = (voltage – 0.5) * 100 ;
  Serial.print(temperatureC);
  Serial.println(” degrees C”);
 
  float tempC = (sensors.getTempCByIndex(0) * 9.0 / 5.0) + 32.0;  //If wanting Celcius, remove “* 9.0 / 5.0) + 32.0”
  float temperatureF = ((float)tempC * 9.0 / 5.0) + 32.0;
  Serial.print(temperatureF), 0; Serial.println(” degrees F”);

  int chk = DHT11.read(DHT11PIN);    //read thermistor value
  long a =1023 – analogRead(analogPin);

 if ((float)tempC < 73.00) {  //This will make the LEN on Pin4 blink if the temp from the "Probe" is lower than given temp
  digitalWrite(ledPin4, HIGH);
  }
  else {
    digitalWrite(ledPin4,LOW);
  }

//  lcd.clear();  //–can be used to reset the screen

/*—- 1st Line of the LCD —-*/
  lcd.setCursor(0, 0);
  lcd.print(“THUMPER BIO MONITOR”);

  Serial.print(” Requesting temperatures…”);
  sensors.requestTemperatures();     // Send the command to get temperatures
  Serial.println(“DONE”);

  Serial.print(“Temperature for Device 1 is: “);
  Serial.print(sensors.getTempCByIndex(0), 2); // This will print Celcius
    // You can have more than one IC on the same bus.
    // 0 refers to the first IC on the wire
  Serial.print(“Read sensor: “);
  switch (chk)
  {
    case 0: Serial.println(“OK”); break;
    case -1: Serial.println(“Checksum error”); break;
    case -2: Serial.println(“Time out error”); break;
    default: Serial.println(“Unknown error”); break;
  }

/*—-Used for Celcius —-*/
  /*—-lcd.print(“C=”);
  lcd.print((float)DHT11.temperature, 0);
  Serial.print(“Temperature (oC): “);
  Serial.println((float)DHT11.temperature, 2);—-*/

/*—- 2nd Line of the LCD —-*/
  lcd.setCursor(0, 1);
  lcd.print(“Humidity:    “);
  lcd.print((float)DHT11.humidity, 0);
  lcd.print(“%”);
  Serial.print(“Humidity (%): “);
  Serial.println((float)DHT11.humidity, 2);

/*—- 3rd Line of the LCD —-*/
  lcd.setCursor(0, 2);
  lcd.print(“Air Temp:    “);
  lcd.print(Fahrenheit(DHT11.temperature), 2);
  lcd.print((char)223);    //degree
  Serial.print(“Temperature (oF): “);
  Serial.println(Fahrenheit(DHT11.temperature), 2);

/*—- 4th Line of the LCD —-*/
  lcd.setCursor(0, 3);
  lcd.print(“H20 Temp:    “);
  lcd.print((float)tempC), 0;
  Serial.print(sensors.getTempCByIndex(0), 0);
  Serial.print(DallasTemperature::toFahrenheit(tempC), 0);
  lcd.print((char)223);
  lcd.print(” “);

//  — Other Options —  //
/*—-
  Serial.print(“Temperature (K): “);
  Serial.println(Kelvin(DHT11.temperature), 2);
  Serial.print(“Dew Point (oC): “);
  Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
  Serial.print(“Dew PointFast (oC): “);
  Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
—-*/
  delay(250);  // Delay used to allow the LED to stay on if needed for 250 miliseconds
  digitalWrite(ledPin4,LOW);
  delay(250);  // Delay used to allow the LED to turn off and to allow time between the reading of the sensors
}
/* –(end main loop )– */

/*—–( Declare User-written Functions )—–*/

//Celsius to Fahrenheit conversion
double Fahrenheit(double celsius)
{
        return 1.8 * celsius + 31.0;
}

//Celsius to Kelvin conversion
double Kelvin(double celsius)
{
        return celsius + 273.15;
}

// dewPoint function NOAA
// reference: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
        double A0= 373.15/(273.15 + celsius);
        double SUM = -7.90298 * (A0-1);
        SUM += 5.02808 * log10(A0);
        SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
        SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
        SUM += log10(1013.246);
        double VP = pow(10, SUM-3) * humidity;
        double T = log(VP/0.61078);   // temp var
        return (241.88 * T) / (17.558-T);
}

// delta max = 0.6544 wrt dewPoint()
// 5x faster than dewPoint()
// reference: http://en.wikipedia.org/wiki/Dew_point
double dewPointFast(double celsius, double humidity)
{
        double a = 17.271;
        double b = 237.7;
        double temp = (a * celsius) / (b + celsius) + log(humidity/100);
        double Td = (b * temp) / (a – temp);
        return Td;
}